Portable thermal printing apparatus including a security device

Details Portable thermal printing apparatus including a security device Portable thermal printing apparatus including a security device

1994-11-30

1997-03-18

Cangialosi, Salvatore

Cryptography

Electric signal modification

Having production of printed copy

380 24, H04L 900

Patent

active

056130074

ABSTRACT:
An apparatus for printing on a substrate includes a device for printing indicia on a substrate; a control that controls the indicia printing device, the control including apparatus for establishing a communicating link with an external device, the establishing apparatus including a protocol which utilizes an encryption key, the protocol operable for establishing the communicating link if the encryption key is properly used, the control including apparatus for providing a tampering code as part of the indicia if the encryption key is not properly used.

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